Duplex air rotor



Feb. 2 1926.

El. SCHAFRAN DUPLEX AIR ROTOH 3 Sheets-Sheet 1 Original Filed May l5,1922 Feb i. SCHAFRAN DUPLEX AIR RoToR original Filed .may 15, 1922 5Sheets-shed 2 if 5 3 @Hernani Feb. 2, 192e. 1,571,303'

l. SCHAFRAN DUPLEX AIR ROTOR Original Filed May l5, 1922 5 Sheets-Sheet3 Patented yFeb. 2, 1926.

UNTED STATES PATENT OFFICE.

ISAAC SCI-IAFBJAN, OF NEW YORK, N. Y., ASSIG-NOR QF ONE-HALF TO LOUISBRUGER,

OF MONTREAL, QUEBEC, CANADA.

DUPLEX AIR ROTOR.

Application filed May 15, 1922, Serial No. 561,195, Renewed November 28,1925.

To all whom t may concern Be it known that I, Isaac SoHArnAN, a citizenof Rumania, residing at 301 Madison Avenue, New York city, in the Stateof New York, in the United States of America, have invented certain newand useful Improvements in Duplex Air Rotors; and I do hereby declarethat the following is a full, clear,

land exact description of the invention, such vas will enable othersskilled in the art to lwhich it appert-ains to make and use the same.

yutilized in driving an aeroplane, while the back stream, which isincidental to the thrust, is ydirected rearwardly. This back stream haslas yet not been utilized, and the object of this invention resides inthe means for utilizing the back stream in conjunction with the thrust.

In the accompanying drawings and specification, the principle of theinvention is shown'as applied to a generator. A pair of shafts areemployed, to one of which a propeller is fixed. The thrust of thepropeller resultsin rotation of the shaft. The other shaft carries aturbine disposed within the back stream of the propeller and adapted toutilize the same whereby the turbine is rotated. These two movements,which are in opposite directions, are available for the rotation of a.magnetic field and an armature therein, these latter elements beingmounted respectively on the two shafts.

In the accompanying drawings in which an illustrative form of generatoris shown:

Figure 1 is a front view of the device;

Figure 2 is a similar fragmentary view in section; y

Figure 3 is a section on the line 3-3 of Figure 1;

Figure 4 is a detail of one of the yokes;

Figure 5 is a section on the line 5-5 of Figure 1;

Figure Figure 1;

Figure 7 is a section on the line Figure 1; and,

6 is a section on the line 6-6 of Figure 8 is a section on the line 8-8of Figure 1, showing the means of supplying current to the propellermotors.

Referring to the drawings by reference characters throughout the variousviews, the numeral 1 indicates a pair of journal bea-rings consisting ofpillows 2 and caps 3. shaft 4 is supported at its ends for rotation inthe bearings according to any usual or desired manner. A turbine 6 iskeyed to this shaft preferably at the intermediate portion thereof for apurpose later to be described. At each side of the turbine is a hollowshaft 7 carrying a wheel 8 at one end and a drum 9 at the other. Thesehollow shafts surround and are concentric with the first named shaft 4,and are supported in this position by means of thejournal bearings 10.The respective wheels 8 are connected to one another by means of theyokes 11 at any desired number of places along their circumferences. Thesaddles 12 of the yokes are inclined towards the turbine, and eachsaddle supports a motor 13 to the rotor or shaft of which is keyed apropeller 14. These propellers are of the aerial type, and are capableof driving themselves forward and at the same time delivering a backstream. The size of these propellers is governed entirely by conditions,and in all cases they should be inclined toward the turbine in such amanner as to deliver their back stream thereto with the utmostefficiency. This condition is governed largely by the inclination of thesaddles 12.

Each drum 9 has secured to its inner surface a plurality of windings orcoils 15 which carry a current and thus constitute a magnetic fieldsuitable for a generator. It is to be noted here that these poles, beingimmovable relatively to the wheels 8, are rotated with them, namely, inunisonV with the thrust of the propellers 14. The outer ends of theinner shaft 4, which protrude beyond the hollow shaft 7 each carry anarmature 16 disposed within one of the magnetic fields and adapted tocooperate therewith. The armature illustrated in this instance is of thespider type, having spiders 17 and a winding 18, as clearly shown inFigure 6.

For the purpose of supplying current to the motors 13, contact rings 19are mounted at the side of one of the wheels 8, and current is conductedto these rings through the brushes 20. Conductors 21 form a circuit inFigure 5.

from the rings through the motors. The commutator 22 `of the Vgeneratoris engaged by commutator brushes 23 through which the current flows tothe collector rings 24 mounted on the outside of the drums 9. Theserings are insulated from the drum by means of a band 25. The current isconducted away from the collector rings through the brushes 26 in a wellknown manner. A similar set of slip rings 27 are likewise mounted on thedrum and insulated thereiroiii by means of the band 25. These rings arein circuit with the iield coils tor supplying current thereto, whichcurrent is delivered to the rings through the brushes 28. n

The operation of the device is as follows: A current `having beensupplied to the motors 13 in any usual or well known manner, the aerialpropellers ltare set in rotation, whereupon 'the yokes 1l and wheels 8are vdriven lin the direction of the arrow a Asalready pointed out, thedrums 9 and the magnetic fields contained therein are rotated in thesame direction. Theback stream of these propellers is driven against theturbine 6, the blades 6 of which are soarranged with respect to thepropellers as to yreceivethe full force of the back stream, whereuponthe turbine is driven in the direction of the arrow Z) in Figure 5. Thiskmovement is directly imparted to the shaft 4C, since the turbine iskeyed thereto,

`and as a consequence the spider armature 17 is simultaneously rotatedin thesame Vdirection. Tlietinal result is the opposite movements of thepoles vl5 and the armature 17 and the consequent production of an elec-rtric current.

It will be understood that the generator described and illustrated maybe modified in several ways in order to make lit better suitable i''orparticular :uses Yfor lwhich it is 'destined without departing from thespirit or' the invention. For instance, the nature of the various.windings and the manner of winding them on the respective shafts maybealtered tonn'ieet required conditions. The invention is to beunderstood, however, as a vrmeans ljtor utilizing all the availablepower fromv a propeller, as indicated by .pended claims.

Having thus fully ldescribed the inventhe ap- ',adapted to rotate thesame, a

the same, a second movable body disposed in and adapted to be moved bythe back stream ot the said propeller, and means for combining theenergy delivered by the two bodies.

2. A motive mechanism comprisinga pair of shafts, one within the other4and Supported for independent rotation, a propeller supported on one otsaidy shafts and adapted to rotate the same, and a turbine-keyed to theother shaft, said turbine being disposed inthe back stream of saidpropeller.

I 3. A motive mechanism comprising a pair of shafts, one within theother and supported ttor independent rotation, a propeller supported onone of said shafts and adapted to rotate the same, a turbine keyed tothe other shaft, said turbine being disposed in the .back stream of saidpropeller, a field frame carried by one of said shafts, a magnetic fieldarranged within saidframe, and an armature carried by the other shaftand disposed within the ield.

4. A motive mechanism comprising a pair of shafts, one within the otherand sup- Eportedfor independent rotation, a propeller 4supported on oneof said shafts and adapted to rotate the same, a turbine keyed to :the

vother shaft, 4said turbine being disposed in fthe back stream ot saidpropeller, a drum carried by one of said shafts, a imagnetic fieldarranged within said drum, an armature carried by the other shaftanddisposed within the field.

k5. A motive mechanism comprising a pair of shafts, one within theother, the inner shaft extending beyond the outer one, a propeller:supported on the outer yshaft and turbine .keyed to the inner shaft anddisposedin the back stream of the propellenadrum fixed to the end of theouter shaft, a magnetic Afield yarranged .within said drum, andanarmature fixed to the protruding end of the inner shaft and within thefield.

In witness whereof I have hereunto set my hand. f l.

ISAAC SCHAFRAN.

